Mike stared at the stableboy with fire in his eyes. If he could just get this saddle off him he'd grind this kid into dust. He opened his mouth to tell him off, "F-f-f..." he struggled. He was trying to say _fuck you_, but he couldn't get more than the first letter out! "F-f..." he stammered before it dawned on him. The stableboy had given him four choices, and he was only allowed to repeat one of those!
While Michale struggled with that, the stableboy simply smiled and dropped three of the brushes. "Filly it is, then!" he said as he started brushing.
Michale didn't even have time to react before he felt a wave of magic come over him. It started at his shoulder and sweapt over his head, then back to his tail. The world seemed to spin, faster and faster, as he felt the stableboy bush him down. In just a few moments, it was over, and the stableboy stepped back to admire his handywork.
Michale looked himself over with his new, equine eyes. He was still a massive animal, but he was just an animal. And on closer inspection, he was now a she. The stableboy had taken his one letter reply seriously, though deep down Michale wasn't sure he... she... had ever really had a choice.
"Don't worry," said the boy, "You're a fine filly. You'll make a wonderful plow horse for your new owners, and before too long, you'll make a lovely broodmare."